Hypertext Webster Gateway: "monomania"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Monomania \Mon`o*ma"ni*a\, n. [Mono- + mania.]
Derangement of the mind in regard of a single subject only;
also, such a concentration of interest upon one particular
subject or train of ideas to show mental derangement.
Syn: Insanity; madness; alienation; aberration; derangement;
mania. See {Insanity}.
From WordNet (r) 1.7 (wn)
monomania
n : a mania restricted to one thing or idea [syn: {possession}]
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